import java.awt.Graphics;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.HeadlessException;
import java.awt.Image;
import java.awt.Transparency;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.PixelGrabber;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;

public class CropImageVer2 {

	/**
	 * @author INDREK
	 * 
	 * @see piltide resizemine *transparent: WORKING! *eri pikkus/k6rgus suhtega
	 *      pilte ei venita v2lja: WORKING!
	 * 
	 * @see !!! hetke versioon tegutseb C:/minuKaust/ kaustas, ehk kui soovid
	 *      seda t88tamas n2ha, siis loo oma C: kettale kaust "minuKaust" ja
	 *      pane sinna algfail sisse. Samuti tekib sinna ka loodav fail.
	 * 
	 * @param sourceFileName
	 *            algfaili nimi (mille suurust soovid muuta) NB!!! laiendi nimi
	 *            tuleb samuti panna NB2!!! kasuta " " m2rke
	 * 
	 * @param destinationFileName
	 *            uue, loodava faili nimi (mille suurus on muudetud) NB!!! laiendi nimi
	 *            tuleb samuti panna NB2!!! kasuta " " m2rke
	 * 
	 * @param width
	 *            - soovitud laius
	 * @param height
	 *            - soovitud k6rgus
	 * 
	 */

	public void cropImage(String sourceFileName, String destinationFileName, int width, int height) {

		try {

			// input
			Image image = new ImageIcon("images/" + sourceFileName).getImage();
			BufferedImage outImage = toBufferedImage(image, width, height);

			// j2lgime ega pilti ei moonutaks
			double originalWidth = outImage.getWidth(); // 200
			double originalHeight = outImage.getHeight(); // 324
			
			
			if ( originalWidth < width || originalHeight < height){
				width = (int) originalWidth;
				height = (int) originalHeight;
				//siia tuleb pahaha error
			}

			// suurem k�lg peab saama max kasutaja s�testatud suuruse
			
			double suhe = originalWidth / originalHeight;

			if (suhe < 1.0) {
				suhe = suhe + 1;
			}

			if (originalWidth >= originalHeight) {

				/*DEBUG
				 * System.out.println("laius " + originalWidth +
				 * " on suurem kui k6rgus " + originalHeight);
				 * System.out.println("laius on korda suurem: " + suhe);
				 * System.out.println("m22ratud laius: " + width);
				 * System.out.println("m22ratud k6rgus: " + height);
				 */
				double modifitseeritud = (double) (height / suhe);

				/*
				 * DEBUG
				 * System.out.println("uus laius: " + width);
				 * System.out.println("uus k6rgus: " + modifitseeritud);
				 */

				height = (int) (modifitseeritud);
				outImage = toBufferedImage(image, width, height);

			}

			else {

				/*DEBUG
				 * System.out.println("laius " + originalWidth +
				 * " on v2iksem kui k6rgus " + originalHeight); // laius j��b
				 * samaks System.out.println("k6rgus on korda suurem: " + suhe);
				 * 
				 * System.out.println("m22ratud laius: " + width);
				 * System.out.println("m22ratud k6rgus: " + height);
				 */
				double modifitseeritud = (double) (width / suhe);

				/*DEBUG
				 * System.out.println("uus laius: " + modifitseeritud);
				 * System.out.println("uus k6rgus: " + height);
				 */
				width = (int) (modifitseeritud);
				outImage = toBufferedImage(image, width, height);

			}

			// output
			File tempFile = new File("images/" + destinationFileName);
			OutputStream tmp = new FileOutputStream(tempFile);

			// size of the background
			BufferedImage img = outImage.getSubimage(0, 0, width, height);

			ImageIO.write(img, "png", tempFile);

			tmp.close();

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public static BufferedImage toBufferedImage(Image image, int width, int height) {
		if (image instanceof BufferedImage) {
			return (BufferedImage) image;
		}

		// This code ensures that all the pixels in the image are loaded
		image = new ImageIcon(image).getImage();

		// Determine if the image has transparent pixels; for this method's
		// implementation, see e661 Determining If an Image Has Transparent
		// Pixels
		boolean hasAlpha = hasAlpha(image);

		// boolean hasAlpha = false;

		// Create a buffered image with a format that's compatible with the
		// screen
		BufferedImage bimage = null;
		GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
		try {
			// Determine the type of transparency of the new buffered image
			int transparency = Transparency.OPAQUE;
			if (hasAlpha) {
				transparency = Transparency.BITMASK;
			}

			// Create the buffered image
			GraphicsDevice gs = ge.getDefaultScreenDevice();
			GraphicsConfiguration gc = gs.getDefaultConfiguration();
			bimage = gc.createCompatibleImage(image.getWidth(null), image.getHeight(null), transparency);
		} catch (HeadlessException e) {
			// The system does not have a screen
		}

		if (bimage == null) {
			// Create a buffered image using the default color model
			int type = BufferedImage.TYPE_INT_RGB;
			if (hasAlpha) {
				type = BufferedImage.TYPE_INT_ARGB;
			}
			bimage = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
		}

		// Copy image to buffered image
		Graphics g = bimage.createGraphics();

		// Size of the actual image
		g.drawImage(image, 0, 0, width, height, null);
		g.dispose();

		return bimage;
	}

	// This method returns true if the specified image has transparent pixels
	public static boolean hasAlpha(Image image) {
		// If buffered image, the color model is readily available
		if (image instanceof BufferedImage) {
			BufferedImage bimage = (BufferedImage) image;
			return bimage.getColorModel().hasAlpha();
		}

		// Use a pixel grabber to retrieve the image's color model;
		// grabbing a single pixel is usually sufficient
		PixelGrabber pg = new PixelGrabber(image, 0, 0, 1, 1, false);
		try {
			pg.grabPixels();
		} catch (InterruptedException e) {
		}

		// Get the image's color model
		ColorModel cm = pg.getColorModel();
		return cm.hasAlpha();
	}

}
